Castle Island Weather Forecast

    • 54
    • 70

    Increasing Clouds

    • 53
    • 68

    Rain Showers Likely

    • 53
    • 67

    Partly Sunny

    • 54
    • 67

    Mostly Sunny

    • 54
    • 70

    Mostly Sunny

    • 56
    • 73

    Partly Sunny

    • 56
    • 72

    Partly Sunny

Today 15 Jul San Juan County

Sunny. Highs in the 70s. Southeast wind to 10 Mph in the morning becoming light.

Tonight 15 Jul San Juan County

Partly cloudy. Lows in the 50s. Southwest wind to 10 Mph becoming south after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Castle Island Temperature Statistics

July Temperature

Whidbey Island Naval Air Station - Ault Field (8.1 miles)

  • Lowest 6 July, 2026

    48 °F

  • Average July

    56.3 °F

  • Highest 13 July, 2026

    66 °F

Climate (2021–2026)

Whidbey Island Naval Air Station - Ault Field (8.1 miles)

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  • Average Low 2021–2026

    44.4 °F

  • Average 2021–2026

    50 °F

  • Average High 2021–2026

    56 °F
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